| // Copyright 2015 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "cobalt/loader/sync_loader.h" |
| |
| #include "base/bind.h" |
| #include "base/compiler_specific.h" |
| #include "base/debug/trace_event.h" |
| #include "base/synchronization/waitable_event.h" |
| |
| namespace cobalt { |
| namespace loader { |
| namespace { |
| |
| ////////////////////////////////////////////////////////////////// |
| // Helpers |
| ////////////////////////////////////////////////////////////////// |
| |
| class FetcherToDecoderAdapter; |
| |
| // This class is responsible for loading resource using the given fetcher and |
| // decoder creators. |
| class LoaderOnThread { |
| public: |
| LoaderOnThread() : waitable_event_(false, false) {} |
| |
| // Start() and End() should be called on the same thread, the sychronous load |
| // thread, so the member objects are created, execute, and are destroyed, |
| // on that same thread. |
| void Start( |
| base::Callback<scoped_ptr<Fetcher>(Fetcher::Handler*)> fetcher_creator, |
| base::Callback<scoped_ptr<Decoder>()> decoder_creator, |
| base::Callback<void(const std::string&)> error_callback); |
| void End(); |
| |
| void Signal() { waitable_event_.Signal(); } |
| void Wait() { waitable_event_.Wait(); } |
| |
| private: |
| scoped_ptr<Decoder> decoder_; |
| scoped_ptr<FetcherToDecoderAdapter> fetcher_to_decoder_adaptor_; |
| scoped_ptr<Fetcher> fetcher_; |
| |
| base::WaitableEvent waitable_event_; |
| }; |
| |
| // This class is responsible for passing chunks of data from fetcher to decoder |
| // and notifying fetching is done or aborted on error. |
| class FetcherToDecoderAdapter : public Fetcher::Handler { |
| public: |
| FetcherToDecoderAdapter( |
| LoaderOnThread* loader_on_thread, Decoder* decoder, |
| base::Callback<void(const std::string&)> error_callback) |
| : loader_on_thread_(loader_on_thread), |
| decoder_(decoder), |
| error_callback_(error_callback) {} |
| |
| // From Fetcher::Handler. |
| void OnReceived(Fetcher* fetcher, const char* data, size_t size) OVERRIDE { |
| UNREFERENCED_PARAMETER(fetcher); |
| decoder_->DecodeChunk(data, size); |
| } |
| void OnDone(Fetcher* fetcher) OVERRIDE { |
| DCHECK(fetcher); |
| decoder_->SetLastURLOrigin(fetcher->last_url_origin()); |
| decoder_->Finish(); |
| loader_on_thread_->Signal(); |
| } |
| void OnError(Fetcher* fetcher, const std::string& error) OVERRIDE { |
| UNREFERENCED_PARAMETER(fetcher); |
| error_callback_.Run(error); |
| loader_on_thread_->Signal(); |
| } |
| |
| private: |
| LoaderOnThread* loader_on_thread_; |
| Decoder* decoder_; |
| base::Callback<void(const std::string&)> error_callback_; |
| }; |
| |
| void LoaderOnThread::Start( |
| base::Callback<scoped_ptr<Fetcher>(Fetcher::Handler*)> fetcher_creator, |
| base::Callback<scoped_ptr<Decoder>()> decoder_creator, |
| base::Callback<void(const std::string&)> error_callback) { |
| decoder_ = decoder_creator.Run(); |
| fetcher_to_decoder_adaptor_.reset( |
| new FetcherToDecoderAdapter(this, decoder_.get(), error_callback)); |
| fetcher_ = fetcher_creator.Run(fetcher_to_decoder_adaptor_.get()); |
| } |
| |
| void LoaderOnThread::End() { |
| fetcher_.reset(); |
| fetcher_to_decoder_adaptor_.reset(); |
| decoder_.reset(); |
| Signal(); |
| } |
| |
| } // namespace |
| |
| ////////////////////////////////////////////////////////////////// |
| // LoadSynchronously |
| ////////////////////////////////////////////////////////////////// |
| |
| void LoadSynchronously( |
| MessageLoop* message_loop, |
| base::Callback<scoped_ptr<Fetcher>(Fetcher::Handler*)> fetcher_creator, |
| base::Callback<scoped_ptr<Decoder>()> decoder_creator, |
| base::Callback<void(const std::string&)> error_callback) { |
| TRACE_EVENT0("cobalt::loader", "LoadSynchronously()"); |
| DCHECK(message_loop); |
| DCHECK(!error_callback.is_null()); |
| |
| LoaderOnThread loader_on_thread; |
| |
| message_loop->PostTask( |
| FROM_HERE, |
| base::Bind(&LoaderOnThread::Start, base::Unretained(&loader_on_thread), |
| fetcher_creator, decoder_creator, error_callback)); |
| loader_on_thread.Wait(); |
| |
| message_loop->PostTask( |
| FROM_HERE, |
| base::Bind(&LoaderOnThread::End, base::Unretained(&loader_on_thread))); |
| loader_on_thread.Wait(); |
| } |
| |
| } // namespace loader |
| } // namespace cobalt |